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History 
 1979: AutoCAD is introduced as "Autocad" by Academy Software.
 1983: Introduction of Object Linking and Embedding (ODE) - an innovative technology which allows users to interact with and edit existing drawing files.
 1990: Introduction of Dynamic Input of PIVOTMOTIONS.
 1990: Introduction of Trackpad.
 1990: Introduction of Interactive Tools.
 1990: Introduction of User-defined layers.
 1992: Introduction of Layer-specific Tool settings.
 1992: Introduction of the original WINDOW command.
 1993: Introduction of AUTOBILL.
 1993: Introduction of Autosized drawings.
 1994: Introduction of Custom Layouts.
 1994: Introduction of Unusual Tools.
 1995: Introduction of Check-Out (Drawing Tracking).
 1996: Introduction of Smart Panels.
 1997: Introduction of Retract/Extend (Drawing Collapse).
 1999: Introduction of the Smart Drawing Viewport.
 1999: Introduction of Layer Grouping and Layers.
 2000: Introduction of Computer-aided Design (CAD) Methods.
 2000: Introduction of Transparency.
 2001: Introduction of Time Management (Scheduling), Animation and Data Management.
 2001: Introduction of the extended Block symbol set.
 2002: Introduction of Geometric tools.
 2002: Introduction of the ribbon bar.
 2003: Introduction of the 50MM level.
 2003: Introduction of the 2-sided printing option.
 2003: Introduction of the Java plug-in for AutoCAD.
 2003: Introduction of the Cross-Axis Alignment (CAX) feature.
 2004: Introduction of the Vector Graphics format.
 2004: Introduction of the 1.7 MM level.
 2005: Introduction of the conceptual tab and drawing toolbars.
 2005: Introduction of the Project Management tool.
 2005: Introduction of the extended predefined symbol set.
 2005: Introduction of the configurable toolbar for annotating drawings.
 2005: Introduction of the OLE object-modeling (OM) programming interface.
 2006: Introduction of the interactive thumbnail browser.
 2006: Introduction of the N3D file format (Collada, etc.).
 2006: Introduction of the Freehand Drawing (FREHAND) feature.
 2007: Introduction of the conditional formatting of text in block text.
 2007: Introduction of the comprehensive use of a single quadrangle as a result of the introduction of 360° rotation.
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AutoCAD's ezmapper 
DXF format with AutoCAD was one of the first code-based file formats to be widely accepted.
 Drawing Interchange File Format (DDF) 
Introduced in 1988, the DDF file format has been adopted by several CAD software packages for sharing and exchanging both 2D and 3D data. Introduced in 1988, the DDF file format has been adopted by several CAD software packages for sharing and exchanging both 2D and 3D data.
 Get Info Panel 
The Get Info Panel, introduced in AutoCAD 2000, is the primary method of accessing tool options and properties in AutoCAD. The Get Info Panel is the primary method of accessing tool options and properties in AutoCAD. It is accessed via the Properties tool in the right click menu of a tool or via the Properties panel, accessible from the View tab.
A new option was added to the Properties panel in AutoCAD 2011.  By default the option is enabled.
 History 
While not a bug per se, early versions of AutoCAD and similar products used "Octal" for coordinate and text reference values. The use of such "octal" references has often led to confusion between users and resulted in bugs. Octal numbers are not convenient for display or analysis, and have since been replaced with an improved system of displaying and calculating coordinate values. The "octal" system of references was replaced by the standard numerical system in AutoCAD 2003.
Originally, AutoCAD stored coordinates in decimal numbers, but began to store coordinates as binary numbers in AutoCAD 2000, in place of the octal system. Starting with AutoCAD 2007, coordinates are stored in the standard decimal number system, including position/alignment/coordinate spaces.
 XML 
AutoCAD has supported the Extensible Markup Language (XML) since version 2006 for import/export, along with the drawing file format DXF. In AutoCAD 2012, XML is used to pass information to/from a user's background application such as Microsoft Word, PowerPoint or Excel.
 Interface 
The 3D Interface was introduced in AutoCAD 2010, providing a 3D user interface with support for 3D modeling and rendering.
 Modules 
A module is a collection of items, such as commands, menus, dialogs, shortcut menu items, datatypes, etc., that are displayed on a menu bar.
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